Life is present on Earth because of oxygen
a. True
b. False
Indicate whether the statement is true or false
False
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The Lyman series of hydrogen corresponds to electron transitions from higher levels to n = 1 . What is the longest wavelength in that series? (h = 6.63 × 10^-34 J×s. The ground state of hydrogen is at –13.6 eV.)
a. 91.4 nm c. 456 nm b. 273 nm d. 122 nm
How did star formation likely proceed in the protogalactic cloud that formed the Milky Way?
A) The stars that formed first could orbit the center of the galaxy in any direction at any inclination. B) The stars that formed first eventually settled into a galactic disk, circling the center of the galaxy. C) The protogalactic cloud gradually formed stars, starting from the center of the galaxy working outward. D) The protogalactic cloud gradually formed stars, starting from the outer edges of the spiral arms and working inward.
The acceleration of an object as a function of time is given by a(t) = (3.00 m/s3)t, where t is in seconds. If the object has a velocity 1.00 m/s at time what is the displacement of the object between time t = 2.00 s and time t = 4.00 s?
A) 33.0 m B) 30.0 m C) 36.0 m D) 27.0 m
A boy throws a ball with an initial velocity of 25 m/s at an angle of 30° above the horizontal. If air resistance is negligible, how high above the projection point is the ball after 2.0 s?
A) 25 m B) 43 m C) 13 m D) 50 m E) 5.4 m